* Removed duplicate entries
* Prevented workflows and activities from starting when the parent workflow is being cancelled
* Added cancellation to execution contexts
* Added store for workflow execution contexts
* Added cancellation to workflowRuntime
* Removed calling BookmarkPersistedHandler when persisting bookmarks.
* Added endpoint for bulk cancelling tasks
* Added tests for cancelling workflows
* Prevented cancelling the cancellation process since it could have unwanted effects
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Co-authored-by: Sipke Schoorstra <sipkeschoorstra@outlook.com>
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